Review by paneradfisk

UPDATE 2014-04-12:
I don't use this anymore because I don't feel like it (or any primer) makes my foundation look better or last longer - and I don't feel that I need any help with my foundation as I'm already satisfied with the longevity of my foundation. Also, this primer is practically the same as any other silicone primer like Too Faced and The Balm or even Monistat chafing gel.
Packaging:
The one I have comes in a clear, plastic tube and it's easy to squeeze out the amount you need, and no product will be wasted as you can get everything out, and you can see how much is left. The cap is a screw cap so it won't leak.
Formula:
It's made of silicone, so it is thick at first but feels thinner after you rub it between your palms. Feels slippery and smooth. It's easy to spread over your face and it won't feel thick or nasty. It can feel a little greasy after you applied it on oily skin, but for dry skin it's great. It doesn't have any particular smell and it has no colour, it is like a clear silky gel.
Price:
This is very expensive but lasts quite a while as you don't need much each time. For me it lasts 6 month.
Personal opinion:
This is the only primer that prevents foundation from creasing around my chin, mouth, nose and under eyes. I love the silky smooth feel of it, and my makeup stays on all day until I take it off. Using other primers like MAC Prep + Prime my foundation creases and fades during the day. It is expensive, but worth it considering it's the only primer that works for me.
Advice:
Get a sample or travel size. The full size is expensive and if you happen to dislike it, it wouldn't be a huge loss if you got the travel size.
4/5, would get 5 if it costed less.